You find ways to give your partner pleasure. And it's not at all related to your size. I'd say you're letting your ego get in the way possibly because of a misconception about how size related to a woman's pleasure. There's no reason to feel emasculated (and, besides, masculinity doesn't reside solely in your penis, right? It's also your own confidence in your own sexuality -- and that should lead you to enjoy giving your partner pleasure in different ways.)